Chicks integrating themselves?

I just went out to check on the littles that arrived yesterday afternoon and found them happily scratching and pecking away with their full grown sisters. Obviously that was not our plan for integrating four week old pullets, but they popped back through the holes in the barrier when I shooed them back towards their side. So my question is this; would you, oh wise members of BYC, fix it, or forget about it? I can't do anything about it tonight or tomorrow really except lock them in their coop if necessary. I am home with a nasty stomach bug and not up to run construction. I'm also tempted to leave it because even if the big girls decide to peck, the littles have an escape route. Advice please